Vise.



No. 703,376. Patented July I, |902.

c. n. BINGHAM.

VISE.

(Application filed Feb. 7, 1902.) (No Model.)

lam f lllllllll lli llll Wzinamen UNITED STATES PATENT OFFICE;

CHARLES DARWIN BINGHAM, OF \VATERTOVVN, NEW YORK, ASSIGNOR TO PRENTISSVISE COMPANY, OF NEW YORK, N. Y.

VISE.

sPEUIFIlUATlUN forming part Of Letters Patent No. 703,376, dated July 1,1902.

Application filed February '7, I902. Serial No, 93,068. (No modeli Toall whom it may'concern:

Be it known that 1, CHARLES DARWIN BING- HAM, of Watertown, in thecounty of J efferso'n and State of New York, have invented anew anduseful Improvement in Vises, of which the following is a specification.

My improvement relates to what are known as parallel-jaw bench-Vises.Its object is to strengthen the vise and to enable it to moreeffectively resist tensional strain without enhancing the expense ofconstruction.

I will first describe by reference to the accompanying drawings themanner in which my invention is carried into eifect and will then pointout more particularly in the claini those features which I believe to benew and of my own invention.

In the drawings, Figure 1 is alongitudinal central section of amachinists vise embodying my invention. Fig. 2 is abottom plan of themovable jaw detached. Fig. 3 is a front elevation of-the movable jaw.Fig. 4 is a rear elevation of the backjaw or body of the vise.

A is the cast-iron back jaw or body of the vise, which is what is knownas a paralleljaw bench-vise. To it is fixed the nut B, which is engagedby the vise-screw E of the movable jaw.

O is the head of the movable jaw. D is its shank, made of wrought ironor steel and having the form of a tubular cylinder. In practice I makeit out of the regular gas-pipe of commerce, which is comparatively cheapand can be had in a sufficient variety of sizes and thicknesses to makeit available for any desired range in sizes of vises. The head 0 is castupon the exterior of the wrought-metal cylindrical tubular slide orshank D, the two being united by and during the operation of casting thehead 0, and the shank D is then longitudinally slotted, as at (Z, topermit it to straddle the neck I) of the nut B, which is housed in theshank and engages the screw E,

as shown. The cast-iron of the head 0 is stopped out of or excluded fromthe interior of shank D. If admitted thereto, it would perform no usefuloffice, because in cooling it would shrink and draw away from theinterior surface of the pipe. By omitting it there is less boring andcutting of the head for the passage of the screw, and I am also enabledto provide within the compass of the head a chamber f, which may beutilized for a variety of purposes. In the present instance it containsthecollar c, by whichthe screw E is swiveled in the head. This collarafter the screw is inserted through the hole bored for it in thecomparatively thin front wall of the head is slipped on the stem of thescrew to the position shown in Fig. 1 and is there secured tothe shankby a set-screw c, which can be reached through a hole 6 in the head Cand pipe D. The vise thus made is exceed ingly strong, durable, andefficient, the cost of construction is not enhanced, the screw iscompletely housed and protected, and the defects incident to priorconstructions, whether 'cast-iron'or wrought-irongare done away with.

lVith very'f'ew exceptions all parallel-j aw bench-Vises, so far as I aminformed, aremade of cast-iron'and possess the defects incident tothatmaterial, which is'stron'g in compression, but comparatively weak intension. The strain which tends to break such vices is in most casesthat which tends to hold the jaws apart against the pressure of thescrew. This strainis greatest directly underneath the opbeenobjectionable and unsatisfactory for the reason, among others, that theintense heat to which it or a portion of it is subjected in theoperation of casting and molding the castiron jaw upon it tendsto-materially put it out of shape and distort it out of true to such anextent as to make it useless until restored to its'original and propershape, which lat ter cannot be done except ata costwhichis practicallyprohibitory; but by giving the wrought-metal shank a tubular cylindricalform these objections are to a very great extent, if not entirely,removed. The wrought metal is put into the best shape possible to resistany tendency to distortion due to the IOO casting operation and toeffectively maintain its original shape. The Wrought-metal tube ofcourse is, as hereinbefore stated, left intact until after the cast-ironhead of the jaw is fully completed. The longitudinal slot d in the underside of the tube is then milled;

but the tube not being afterward exposed to heat is not distorted, butretains its original shape.

What I claim herein as new, and desire to secure by Letters Patent, isas follows:

In a vise a sliding jaw composed-o1": a castiron head a Wrought-metalpipe-shank united with the cast-iron head by and during the castingoperation, and longitudinally slotted, I5

for the passage of the neck of'the feed-nut on the stationary jaworvisie-body, and a screw to engage said nut swiveled' in the front wallof the cast-metal head and housed in the Wrought-metalpipe-shank, asand. for the 20 purposes hereinbetore set forth,

In testimony whereof I have hereunto set my hand this 1st day ofFebruary, 1902.

CHARLES DARWIN BINGHAM.

Witnesses:

FRANK WENZEL,

O. E. KINNE.

